diff options
| author | Jinjiang Tu <tujinjiang@huawei.com> | 2025-07-24 17:09:58 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-08-02 12:06:10 -0700 |
| commit | 1623717b057f904d558eb0489fbd592a18750c1e (patch) | |
| tree | 8d98895f8f50945ff5bc9b76a5283a00b6c05cef | |
| parent | 9109bd52559b44a66e4dbde69d0dd36f3e4dcae8 (diff) | |
mm/mincore: hold PTL in mincore_hugetlb
Hold PTL in mincore_hugetlb() to avoid operating on stale page, as
mincore_pte_range() have done.
Link: https://lkml.kernel.org/r/20250724090958.455887-4-tujinjiang@huawei.com
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrei Vagin <avagin@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brahmajit Das <brahmajit.xyz@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Rientjes <rientjes@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Joern Engel <joern@logfs.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
| -rw-r--r-- | mm/mincore.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/mm/mincore.c b/mm/mincore.c index 42d6c9c8da86..10dabefc3acc 100644 --- a/mm/mincore.c +++ b/mm/mincore.c @@ -29,7 +29,9 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr, #ifdef CONFIG_HUGETLB_PAGE unsigned char present; unsigned char *vec = walk->private; + spinlock_t *ptl; + ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte); /* * Hugepages under user process are always in RAM and never * swapped out, but theoretically it needs to be checked. @@ -38,6 +40,7 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr, for (; addr != end; vec++, addr += PAGE_SIZE) *vec = present; walk->private = vec; + spin_unlock(ptl); #else BUG(); #endif |